United, American, and Delta ban transport of hunting trophies

After the illegal killing of Cecil the lion in Zimbabwe, American, Delta, and United Airlines have all banned the transport of big-game trophies on flights. They made announcements stating that buffalo, rhinoceros, lion, leopard, and elephant remains will no longer be allowed on flights. Delta was served with an online petition asking it to ban big-game trophies; the airline flies non-stop to a number of African cities.
No official reasons have been given for the announcement from the three airlines, but the decision has been put into effect immediately. Several other airlines have also indicated they will be stopping all transport of trophy-hunting kills.
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